[jira] [Created] (TAJO-843) implements COALESCE for BOOLEAN, DATE, TIME, TIMESTAMP

[Hyoungjun Kim (JIRA)]

Hyoungjun Kim created TAJO-843:
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             Summary: implements COALESCE for BOOLEAN, DATE, TIME, TIMESTAMP
                 Key: TAJO-843
                 URL: https://issues.apache.org/jira/browse/TAJO-843
             Project: Tajo
          Issue Type: Improvement
            Reporter: Hyoungjun Kim
            Priority: Trivial


See the title. Currently Tajo's COALESCE function only supports INT, FLOAT, 
TEXT. We need COALESCE function for BOOLEAN, DATE, TIME, TIMESTAMP types.




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